Stop mechanism for sewing and other machines



2 Sheets-Sheet 1.

(No Model.)

J. W. L'UI'KIN. STOP MECHANISM FOR SEWING AND OTHER MACHINES.

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(No Model.) 2-,sn,ets sheet 2. V I J. W. LU-PK IN. V STOPMEGHANISM-FOR SEWING'AND OTHER MACHINES.

Patented Aug. 10-, 1886.

UNIT D S T S] PAT-SENT QFFICE..

JOHN \V. LUFKlN, OF \VINOHESTER, MASSACHUSETTS.

STOP MECHANISM FORSEWING AND OTHER MACHINES.

SPECIFICATION forming part of Letters Patent No. 347,053, dated August 10, 1886.

Application filed January 8, 1886. Serial Nov 187,974. (No model.)

To all whom, it may concern:

Be it known that I, JoHN W. LUFKIN, of WVinchester, connty of Middlesex, and State of Massachusetts, have invented an Improve ment in Stop Mechanism for Sewing and other Machines, of which the following description, in connection with the accompanying drawings, is a specification,like letters on the drawings representinglike parts.

This invention has for its object to provide,

for sewing and other machines means where by the same may be stopped at'a definite timeas, for instance, when an article to be made by the machine has been finished.

In accordance with my invention, a frictionpulley fast to the main shaft of the machineis acted upon by the periphery of a belt-driven pulley, which rotates on a hub ofia lever piv: oted eccentrically to the said hub, the lever being held in place withits peripheryin driving contact with the pulley on themain shaft by means of a holding-bar, which, as herein shown, is actuated in one direction by a lever and cam, and in the other direction by a spring.

Figure 1 in broken side elevation represents a suflicient portion of a sewingmachine to illustrate my improvements; Fig. 2, a partial under side view; Fig. 3, a rear end view thereof, the belt-pulley being shown by dotted lines, so as not to hide the parts behind it,the hand-Wheel being partially broken out; and Fig. 4 is a rear side view of the pulley on the main shaft.

The bed-plate A, upright arm A, main shaft A, its bevel-gear a, the bevel-gear a, shaft A crank or disk at its lower end provided with crank-pin 9, link 9, arm 14, post 13, arm 12, the pawl 6 moved by it, the feed-wheel (1 having grooves f f, cross grooves f and switchesf f, the lever 20, having at one end a roller-stud, 21, are all substantially the same as like parts represented in my application, Serial N 0. 186,182, for United States Patent, filed December 19, 1885, to which reference may be had.

The main shaft A has fast onit the frictionpulley A, the periphery of which is acted upon by the leather or othernon-metallic face, 2, of the belt-pulley A having scored places 3 4, for the reception of a driving-belt extended from any usual driven pulley.

The beltpulley A is mounted on a hub, 5, extended from one side of the pulley-carrying lever D, the said hub (shown by dott-edlinesin Fig. 1) being bored eccentrically and mounted upon a stud, D, having its hearings in cars of a yoke, D, forming part of the fect'D", upon which the bed-plate of the machine is pivoted in usual manner.

The lever D has a brake-shoe, 51, which, when the peripheries of the pulleys A"andA are not in driving cont-act, bears against the periphery of and stops the rotation of the pulley'A and shaft A leaving them in position to keep the needle-bar (not shown, but actuated by the said shaft) in such position as to leave the needle raised to its highest point, such stoppingof the pulley A being effected by the wedge-like portion or stop 56 of the said pulley coming between the jaw-like portion of the brake-shoe. The lower end (see Fig. 3) of the lever D has a foot, D which, when the machine is in operation, the wheel A drivingthe wheel A, rests upon the end of the leverholding bar 44, laid in guide-grooves at the lower side of the bedplate and held therein, but so that it may slide longitudinally,by means of the screws 45 and 46, the latter entering a slot, 47, in the said bar 44. The holding-bar is normally held with its endbeyond the bed-plate by the spring 48, (shown by dotted lines,) the said bar in such position supporting the foot D and keeping the pulleys A A" pressed together.

It is desired to stop.the machine automatically afterthe completion ofa button-hole. To do this, the feed-wheel d besides having at its under side grooves f f, anda cross-groove, f", and switchesf fflto act upon and move a lever, 20, having a roller-stud, 21, that travels in the said groove, as described in the said application, to vary the stroke of the pawl and pawlcarrier, in order to rotate the feed-wheel at a faster or slower speed, has also a rather sharp cam portion,49,(seeFig. 2,) forming part ofthe groove f into which the roller-stud 21 of the lever 20 enters as each button hole is completed.

The position of the partsin Fig. 2 are such as will be occupied by them j ust before thecompletion ofabutton-hole, and in the further rotation of the feedwheel (P in the direction of the arrow thereon the slot 21 will enter the cam portion 49, and the lever 20 will be moved far enough to cause its outer end to strike the pin or stud 50 at theinner end ofthe holding-bar 4-}. and draw it longitudinally, withdrawing the outer end of the said bar from under the foot D when the lever D, having the weight ofthe pulley A 111)- on it and at one side of the stud D will be turned, causing the pulley A to be removed from driving contact with the pulley A, such movement of the lever D causing the brakcshoe 51 to meet the pulley A.

One of the arms of the yoke 1), next the lever 1), has a spring, 53, which turns the said lever on the stud D when the bar 44 is withdrawn from under the foot D The foot Dis made adjustable on the said lever D, in order to enable the contact of the pulleys to be corrcctly made when the foot rests on the holding-bar.

The hand-wheel H is partially broken out in Fia'. 3, to show part of the wedge portion 56.

I claim- 1. The feed-wheel, thelever D, and thebeltpulley thereomand the holding-bar, combined with means intermediate the said feed-wheel and bar to move the said bar and release the said lever. substantially as described.

2. The shaft A and its attached frictionwheel, and the pulley A, and the lever, and a hub. 5, and stud to support it eccentrically, combined with aholding-bar tosustain thesaid lever and maintain the said pulleys in contact, substantially as described.

The lever D, having attached to it thehub and provided with a brakeshoe and with a foot, the stud to support the said lever eccentrically and the yoketo hold the stnd,and beltpulley mounted on the said hub,eombined with the sl1attA",and its attached friction-pullcy A, having the stop to be engaged by the said lever or its brake-shoe to always stop the said pulleyand the shaft A in a definite position, sub stantially as described.

4. The main shaft A, itsattaehcd pulley A, the lever D, provided atone side with the hub, and having a foot, D'yand shoe, the yoke and stud D to support the saidlever eecentrically to the said hub, combined with aspring to act upon the said lever,substantially as described. 5. The shaft A", its attached pulley A, the yoke, its stud, the lever having the hub 5, and pivoted eceentrically on the said hub, and the belt-pulley, combined with the holding-bar and with the adjustable foot resting t l1creon,to operate substantially as described.

In testimony whercoi'I have signed my name to this specification in thcprcsencc of two subscribing witnesses.

JO HN \V. L U FKIN.

\Vi t nesses:

(i. V. Greneonv, C. M. Coma. 

